<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
    <title>Document</title>
</head>

<body>
    <div id="app">
        <button @click="change">点击</button>
        <h3 :style="style1">{{currt}}</h3>
    </div>
    <script>

        new Vue({
            el: "#app",
            data() {
                return {
                    currt: 0,
                    style1: {
                        color: "hotpink",
                        fontSize: "30px"
                    }
                }
            },
            methods: {
                change() {
                    this.style1 = {
                        color: "pink",
                        fontSize: "60px"
                    }
                    this.currt++
                }
            }
        })
    </script>
</body>

</html>